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 Yarrow I. H. H., 1941: Melitta leporina (Panz.) and Nomada flavopicta (Kirby) (Hym., Apidae). 2 pp. [M43] 

 Yarrow I. H. H., 1954: Formica exsecta Nylander (Hym., Formicidae) in the British isles. 3 pp. 

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 Yefremova Z. A., Vidal S., 1997: A new species of Hyssopus Girault, 1916 from Germany (Hymenoptera, Chalcidoidea: Eulophidae). 4 pp. [M23] Entomofauna 18/24: 401-404.

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